#!/usr/bin/perl -w
# ciscoconf.pl

use strict;
use Net::Telnet::Cisco;

my $pass    = '';                          # Cisco vty password
my $timeout = '60';                        # seconds of no response till Net::Telnet::Cisco gives up waiting
my $infile  = "/dir/subdir/ciscoconf.in";  # one-per-line text-file listing of Cisco devices to connect to
my $logfile = "/dir/subdir/ciscoconf.log"; # logfile of script results

print "starting Cisco device sessions\n";  # print to console, not log
open (LOG,">$logfile")   or die "Error opening $logfile: $!\n";

unless (@ARGV) {
    @ARGV = $infile;
    chomp(@ARGV = <>);
}
 
# repeat these actions for each Cisco device at command prompt (or else in ciscoconf.in)
for my $dev (@ARGV) {
    print LOG "#############################################################\n";
    my $cs = Net::Telnet::Cisco->new(Host=>$dev, timeout=>$timeout);
    $cs->login('',$pass);                  # vty login
    $cs->errmode(sub{print LOG @_, "\n"}); # error handler: print $cs->errmsg, "\n";
    print $cs->last_prompt, "\n";          # print Cisco device prompt to console   
    print LOG $cs->last_prompt, "\n";      # print Cisco device prompt to log
    $cs->close;                            # exit Cisco session
    print LOG "#############################################################\n";
}
 
close (LOG)              or die "Error closing $logfile: $!\n";
print "Finished Cisco device sessions\n";  # print to console, not log

# END